China has imposed sanctions on six American companies, accusing them of undermining its national security through military cooperation with Taiwan. Three firms—Sarinc Technologies, Aerocom, and Oceaneering International—were added to Beijing’s “unreliable entities list,” barring them from trade with China. Separately, Huntington Ingalls Industries, Planet Management Group, and Global Dimensions were placed on the export control list, preventing them from receiving dual-use goods. The move comes as U.S. President Donald Trump and Chinese leader Xi Jinping prepare for a high-level meeting.